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Income per Common Share - Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net income $ 6,649us-gaap_NetIncomeLoss $ 11,641us-gaap_NetIncomeLoss
Total dividends on preferred stocks (300)us-gaap_DividendsPreferredStockCash (300)us-gaap_DividendsPreferredStockCash
Numerator for basic net income per common share - net income applicable to common stock 6,349us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 11,341us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends on preferred stocks assumed to be converted, if dilutive 60lxu_PreferredStockDividendsDilutiveNetIncomePerCommonShare 300lxu_PreferredStockDividendsDilutiveNetIncomePerCommonShare
Numerator for diluted net income per common share 6,409us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 11,641us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:    
Denominator for basic net income per common share - weighted-average shares 22,674,739us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,532,522us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:    
Convertible preferred stocks 250,000us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock 916,666us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Stock options 121,763us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 190,519us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive potential common shares 371,763us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,107,185us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for dilutive net income per common share - adjusted weighted-average shares and assumed conversions 23,046,502us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,639,707us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per common share $ 0.28us-gaap_EarningsPerShareBasic $ 0.50us-gaap_EarningsPerShareBasic
Diluted net income per common share $ 0.28us-gaap_EarningsPerShareDiluted $ 0.49us-gaap_EarningsPerShareDiluted
Series B Preferred Stock [Member]    
Numerator:    
Total dividends on preferred stocks (240)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 (240)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series D Preferred Stock [Member]    
Numerator:    
Total dividends on preferred stocks $ (60)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 $ (60)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember